 "
 
 
-[[:subsection {:title "Reffering to Vars: var -- page:  page: 44"}]]
+[[:subsection {:title "Referring to Vars: var -- page:  page: 44"}]]
 
 "Sybols name a var evaluate to that vars value:"
 

    (+ k x))
  => 55)

(fact ":or knows the differnce between no value and 'false' value"
  (let [{opt1 :option} {:option false}
        opt1 (or opt1 true)
        {opt2 :option :or {opt2 true}} {:option false}]

[[:subsection {:title "Eval -- page: 46"}]]

"
encapsulate evaluation semantics
"
(facts "evaluation of literals:"
  (fact (eval :foo)
